Taking some cues from racers and street heroes alike, Holley has
taken their own Model 4150 carbs to the next level with the new Model
4150 HPs. Updates include cast main bodies without choke horns, and
smoothed venturi transitions for increased airflow. Since they're aimed
directly at optimizing power and performance for racing applications,
other important modifications include screw-in air bleeds, stainless
steel throttle plates, notched floats. They also have Dominator style
fuel bowls to allow fuel line plumbing from either side.